With the launch of the Radeon RX 6700 XT today, rumors have started floating up regarding the next Navi 2x GPU in the pipeline. The specifications of the Navi 23 based RX 6600 XT were posted by Yuko Yoshida earlier today. These are the first details of the GPU codenamed Dimgray Cavefish we’re seeing, and as such take them with a grain of salt:
The Radeon RX 6600 XT will reportedly pack 32 Computer Units, down from 36 on the RX 5600 XT and a cut down 128-bit bus paired with 8GB of GDDR6 memory running at 16Gbps. That’s quite the drop from the 192-bit interface that fed the RX 5600 XT and may cause bottlenecks in certain situations. Luckily for AMD, this GPU is geared towards “premium 1080p gaming” and as such, the load on the memory subsystem will be fairly moderate.
| RX 5600 XT | RX 6600 XT | RX 6700 XT | |
|---|---|---|---|
| Arch | Navi | Navi 2X | Navi 2X |
| Die | Navi 10 | Navi 23 | Navi 22 |
| Shader/CU Count | 2,304/36 | 2,048/32 | 2,560/40 |
| Memory | 6GB | 8GB | 12GB |
| Memory Bus | 192-bit | 128-bit | 192-bit |
| Infinity Cache | N/A | 64MB | 96MB |
| ROPs | 64 | 32? | 64 |
| TMUs | 144 | 128? | 160 |
| Bandwidth | 288GB/s | 192GB/s? | 384GB/s |
To make up for the cut-down bus, the budget RDNA 2 GPU is getting 64MB of L3 “Infinity Cache”, with a targeted performance roughly on par with the GeForce RTX 3060. It’s interesting to note that the latter comes with a 192-bit bus and an overall external memory bandwidth of 360GB/s. The Radeon RX 6600 XT, on the other hand, will likely be limited to under 200GB/s, and be a smidge slower.
The source believes that the RX 6600 XT will be launched next month, with the Cezanne desktop APUs (Ryzen 5000G or Ryzen Pro 5000G) slated for a June launch. This would make sense as we’ve started a lot of engineering and qualification samples on Chinese blogs lately.
